Up- and Downconversion Dual-Mode Excitation Spectral Studies of Rare Earth Doped KLaF<sub>4</sub> Nano Emitters for Biophotonic Applications

Deo, Ib Singh; Gupta, Mohini; Prakash, G. Vijaya

doi:10.1021/acs.jpcc.3c05125

Cited by 2 publications

(3 citation statements)

References 46 publications

(57 reference statements)

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“…Observing photoluminescence (PL) spectra at a low doping concentration of Eu 3+ is difficult in the host matrices with high phonon energy. The K 3 GdF 6 host lattice shows enhanced PL features, indicating the low phonon energy of the host lattice and the effect of the coordination environment where Eu 3+ is located . The PL spectra of all the samples under different excitations (273, 393, and 464 nm) are shown in Figures a(ii)–a(iv)).…”

Section: Resultsmentioning

confidence: 96%

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Light Emitting Rare Earth Doped K₃GdF₆:Eu³⁺ for Spectral Mapping/Imaging Studies

Singh Deo,

Gupta,

Vijaya Prakash

2024

ACS Appl. Opt. Mater.

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Herein, we report a strategy to synthesize an Eu 3+ doped singlephase monoclinic K 3 GdF 6 double perovskite via a solid-state route with an average crystallite size of 18 ± 2.00 nm. Characterization methods such as X-ray diffraction, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, and spectroscopic techniques provided a thorough understanding of the material's atomic and molecular-level structural, morphological, and functional properties. The photoluminescence study of K 3 GdF 6 :5% Eu 3+ under different excitations such as 273, 393, 405, and 464 nm showed a hypersensitive, intense red emission at 613 nm and orange emission at 590 nm, which is a necessary parameter for high contrast imaging, particularly for overcoming autofluorescent background. The usage of K 3 GdF 6 :5% Eu 3+ for spectral mapping and imaging has been specifically demonstrated through spatial photoluminescence mapping under 405 nm laser excitation. Moreover, the optical studies substantiated the occurrence of quantum cutting in K 3 GdF 6 :Eu 3+ through systematic energy transfer between Gd 3+ and Eu 3+ . Interestingly, in addition to optical attributes, the double perovskite showed superparamagnetic behavior at low temperature (2 K) with an average saturation magnetization of 96.86 emu/g. Through an exhaustive investigation of its optical and superparamagnetic properties, the synthesized double perovskite has been demonstrated to be a feasible choice for bioimaging (including optical and MRI), multiplexing detection, sensing, and other optical technologies.

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Section: Resultsmentioning

confidence: 96%

“…It is widely known that the Eu 3+ emission can be a sensitive probe to monitor the symmetry at the local site . An estimate of the local symmetry around the Eu 3+ ion can be obtained from the number of multiplet–multiplet transition bands.…”

Section: Resultsmentioning

confidence: 99%

Light Emitting Rare Earth Doped K₃GdF₆:Eu³⁺ for Spectral Mapping/Imaging Studies

Singh Deo,

Gupta,

Vijaya Prakash

2024

ACS Appl. Opt. Mater.

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“…Because of their great mono dispersion, long luminescence lifetime, and high up- or downconversion efficiency, they may have versatile and promising applications as luminescent nano-biolabels. Recent work by Deo et al reported KLaF 4 nanoparticles co-doped with Eu 3+ , Er 3+ , and Yb 3+ ions, allowing simultaneous excitation in the visible and NIR regions, resulting in upconversion and downconversion emissions concurrently [ 29 ]. This dual-mode approach presents valuable applications in bioimaging or information encryption.…”

Section: Introductionmentioning

confidence: 99%

Luminescence Properties of an Orthorhombic KLaF4 Phosphor Doped with Pr3+ Ions under Vacuum Ultraviolet and Visible Excitation

Zdeb,

Rebrova,

Lisiecki

et al. 2024

Materials

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Fluorides have a wide bandgap and therefore, when doped with the appropriate ions, exhibit emissions in the ultraviolet C (UVC) region. Some of them can emit two photons in the visible region for one excitation photon, having a quantum efficiency greater than 100%. In a novel exploration, praseodymium (Pr3+) ions were introduced into KLaF4 crystals for the first time. The samples were obtained according to a high-temperature solid-state reaction. They exhibited an orthorhombic crystal structure, which has not been observed for this lattice yet. The optical properties of the material were investigated in the ultraviolet (UV) and visible ranges. The spectroscopic results were used to analyze the Pr3+ electronic-level structure, including the 4f5d configuration. It has been found that KLaF4:Pr3+ crystals exhibit intense luminescence in the UVC range, corresponding to multiple 4f → 4f transitions. Additionally, under vacuum ultraviolet (VUV) excitation, distinct transitions, specifically 1S0 → 1I6 and 3P0 → 3H4, were observed, which signifies the occurrence of photon cascade emission (PCE). The thermal behavior of the luminescence and the thermometric performance of the material were also analyzed. This study not only sheds light on the optical behavior of Pr3+ ions within a KLaF4 lattice but also highlights its potential for efficient photon management and quantum-based technologies.

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Up- and Downconversion Dual-Mode Excitation Spectral Studies of Rare Earth Doped KLaF₄ Nano Emitters for Biophotonic Applications

Cited by 2 publications

References 46 publications

Light Emitting Rare Earth Doped K₃GdF₆:Eu³⁺ for Spectral Mapping/Imaging Studies

Light Emitting Rare Earth Doped K₃GdF₆:Eu³⁺ for Spectral Mapping/Imaging Studies

Luminescence Properties of an Orthorhombic KLaF4 Phosphor Doped with Pr3+ Ions under Vacuum Ultraviolet and Visible Excitation

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Up- and Downconversion Dual-Mode Excitation Spectral Studies of Rare Earth Doped KLaF4 Nano Emitters for Biophotonic Applications

Cited by 2 publications

References 46 publications

Light Emitting Rare Earth Doped K3GdF6:Eu3+ for Spectral Mapping/Imaging Studies

Light Emitting Rare Earth Doped K3GdF6:Eu3+ for Spectral Mapping/Imaging Studies

Luminescence Properties of an Orthorhombic KLaF4 Phosphor Doped with Pr3+ Ions under Vacuum Ultraviolet and Visible Excitation

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Up- and Downconversion Dual-Mode Excitation Spectral Studies of Rare Earth Doped KLaF₄ Nano Emitters for Biophotonic Applications

Light Emitting Rare Earth Doped K₃GdF₆:Eu³⁺ for Spectral Mapping/Imaging Studies

Light Emitting Rare Earth Doped K₃GdF₆:Eu³⁺ for Spectral Mapping/Imaging Studies